/*
 * Copyright (C) 2020 The zfoo Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and limitations under the License.
 */

package com.zfoo.protocol.serializer.enhance;

import com.zfoo.protocol.generate.GenerateProtocolFile;
import com.zfoo.protocol.registration.EnhanceUtils;
import com.zfoo.protocol.registration.field.IFieldRegistration;
import com.zfoo.protocol.registration.field.MapField;
import com.zfoo.protocol.serializer.CodeLanguage;
import com.zfoo.protocol.serializer.CutDownMapSerializer;
import com.zfoo.protocol.util.StringUtils;

import java.lang.reflect.Field;
import java.util.Map;

/**
 * @author jaysunxiao
 * @version 3.0
 */
public class EnhanceMapSerializer implements IEnhanceSerializer {

    @Override
    public void writeObject(StringBuilder builder, String objectStr, Field field, IFieldRegistration fieldRegistration) {
        if (CutDownMapSerializer.getInstance().writeObject(builder, objectStr, field, fieldRegistration, CodeLanguage.Enhance)) {
            return;
        }

        var mapField = (MapField) fieldRegistration;
        var keyRegistration = mapField.getMapKeyRegistration();
        var valueRegistration = mapField.getMapValueRegistration();
        var keySerializer = keyRegistration.serializer();
        var valueSerializer = valueRegistration.serializer();

        var map = "map" + GenerateProtocolFile.index.getAndIncrement();
        builder.append(StringUtils.format("Map {} = (Map){};", map, objectStr));
        builder.append(StringUtils.format("{}.writeInt($1, CollectionUtils.size({}));", EnhanceUtils.byteBufUtils, map));

        var iterator = "iterator" + GenerateProtocolFile.index.getAndIncrement();
        builder.append(StringUtils.format("Iterator {} = CollectionUtils.iterator({});", iterator, map));
        builder.append(StringUtils.format("while({}.hasNext()) {", iterator));

        var entry = "entry" + GenerateProtocolFile.index.getAndIncrement();
        builder.append(StringUtils.format("{} {}=({}){}.next();", Map.Entry.class.getCanonicalName(), entry, Map.Entry.class.getCanonicalName(), iterator));

        var key = "key" + GenerateProtocolFile.index.getAndIncrement();
        builder.append(StringUtils.format("Object {} = {}.getKey();", key, entry));

        var value = "value" + GenerateProtocolFile.index.getAndIncrement();
        builder.append(StringUtils.format("Object {} = {}.getValue();", value, entry));

        EnhanceUtils.enhanceSerializer(keyRegistration.serializer()).writeObject(builder, key, field, keyRegistration);
        EnhanceUtils.enhanceSerializer(valueRegistration.serializer()).writeObject(builder, value, field, valueRegistration);

        builder.append("}");
    }

    @Override
    public String readObject(StringBuilder builder, Field field, IFieldRegistration fieldRegistration) {
        var cutDown = CutDownMapSerializer.getInstance().readObject(builder, field, fieldRegistration, CodeLanguage.Enhance);
        if (cutDown != null) {
            return cutDown;
        }

        var mapField = (MapField) fieldRegistration;
        var keyRegistration = mapField.getMapKeyRegistration();
        var valueRegistration = mapField.getMapValueRegistration();

        var map = "map" + GenerateProtocolFile.index.getAndIncrement();

        var size = "size" + GenerateProtocolFile.index.getAndIncrement();
        builder.append(StringUtils.format("int {}={}.readInt($1);", size, EnhanceUtils.byteBufUtils));
        builder.append(StringUtils.format("Map {} = CollectionUtils.newFixedMap({});", map, size));

        var i = "i" + GenerateProtocolFile.index.getAndIncrement();
        builder.append(StringUtils.format("for(int {}=0; {}<{}; {}++){", i, i, size, i));

        var keyObject = EnhanceUtils.enhanceSerializer(keyRegistration.serializer()).readObject(builder, field, keyRegistration);
        var valueObject = EnhanceUtils.enhanceSerializer(valueRegistration.serializer()).readObject(builder, field, valueRegistration);

        builder.append(StringUtils.format("{}.put({},{});}", map, keyObject, valueObject));
        return map;
    }

}
